深圳市谷科智电子有限公司

The ISL6208 is a high frequency, dual MOSFET driver,

optimized to drive two N-Channel power MOSFETs in a

synchronous-rectified buck converter topology. It is

especially suited for mobile computing applications that

require high efficiency and excellent thermal performance.

This driver, combined with an Intersil multiphase Buck PWM

controller, forms a complete single-stage core-voltage

regulator solution for advanced mobile microprocessors.

The ISL6208 features 4A typical sinking current for the lower

gate driver. This current is capable of holding the lower

MOSFET gate off during the rising edge of the Phase node.

This prevents shoot-through power loss caused by the high

dv/dt of phase voltages. The operating voltage matches the

30V breakdown voltage of the MOSFETs commonly used in

mobile computer power supplies.

The ISL6208 also features a three-state PWM input that,

working together with Intersil’s multiphase PWM controllers,

will prevent negative voltage output during CPU shutdown.

This feature eliminates a protective Schottky diode usually

seen in a microprocessor power systems.

MOSFET gates can be efficiently switched up to 2MHz using

the ISL6208. Each driver is capable of driving a 3000pF load

with propagation delays of 8ns and transition times under

10ns. Bootstrapping is implemented with an internal

Schottky diode. This reduces system cost and complexity,

while allowing the use of higher performance MOSFETs.

Adaptive shoot-through protection is integrated to prevent

both MOSFETs from conducting simultaneously.

A diode emulation feature is integrated in the ISL6208 to

enhance converter efficiency at light load conditions. This

feature also allows for monotonic start-up into pre-biased

outputs. When diode emulation is enabled, the driver will

allow discontinuous conduction mode by detecting when the

inductor current reaches zero and subsequently turning off

the low side MOSFET gate.